<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // console.log(a1);
        var a1 = 20;
        // console.log(a2);
        let a2 = 10;
        let s1 = `这个数字式${a2}还有一个是${a1}`
        alert(s1);
    </script>
</head>

<body>

</body>

</html>